# Information Schema INNODB\_SYS\_INDEXES Table
The [Information Schema](/docs/server/reference/system-tables/information-schema.md) `INNODB_SYS_INDEXES` table contains information about InnoDB indexes.
The `PROCESS` [privilege](/docs/server/reference/sql-statements/account-management-sql-statements/grant.md) is required to view the table.
It has the following columns:
| Field | Type | Null | Default | Description |
| ---------------- | ------------------- | ---- | ------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| INDEX\_ID | bigint(21) unsigned | NO | 0 | A unique index identifier. |
| NAME | varchar(64) | NO | | Index name, lowercase for all user-created indexes, or uppercase for implicitly-created indexes; PRIMARY (primary key), GEN\_CLUST\_INDEX (index representing primary key where there isn't one), ID\_IND, FOR\_IND (validating foreign key constraint) , REF\_IND. |
| TABLE\_ID | bigint(21) unsigned | NO | 0 | Table identifier, matching the value from [INNODB\_SYS\_TABLES.TABLE\_ID](/docs/server/reference/system-tables/information-schema/information-schema-tables/information-schema-innodb-tables/information-schema-innodb_sys_tables-table.md). |
| TYPE | int(11) | NO | 0 | Numeric type identifier; one of 0 (secondary index), 1 (clustered index), 2 (unique index), 3 (primary index), 32 ([full-text index](/docs/server/ha-and-performance/optimization-and-tuning/optimization-and-indexes/full-text-indexes.md)). |
| N\_FIELDS | int(11) | NO | 0 | Number of columns in the index. GEN\_CLUST\_INDEX's have a value of 0 as the index is not based on an actual column in the table. |
| PAGE\_NO | int(11) | NO | 0 | Index B-tree's root page number. -1 (unused) for full-text indexes, as they are laid out over several auxiliary tables. |
| SPACE | int(11) | NO | 0 | Tablespace identifier where the index resides. 0 represents the InnoDB system tablespace, while any other value represents a table created in file-per-table mode (see the [innodb\_file\_per\_table](/docs/server/server-usage/storage-engines/innodb/innodb-system-variables.md#innodb_file_per_table) system variable). Remains unchanged after a [TRUNCATE TABLE](/docs/server/reference/sql-statements/table-statements/truncate-table.md) statement, and not necessarily unique. |
| MERGE\_THRESHOLD | int(11) | NO | 0 | |
## Example
```sql
SELECT * FROM information_schema.INNODB_SYS_INDEXES LIMIT 3\G
*************************** 1. row ***************************
INDEX_ID: 11
NAME: ID_IND
TABLE_ID: 11
TYPE: 3
N_FIELDS: 1
PAGE_NO: 302
SPACE: 0
MERGE_THRESHOLD: 50
*************************** 2. row ***************************
INDEX_ID: 12
NAME: FOR_IND
TABLE_ID: 11
TYPE: 0
N_FIELDS: 1
PAGE_NO: 303
SPACE: 0
MERGE_THRESHOLD: 50
*************************** 3. row ***************************
INDEX_ID: 13
NAME: REF_IND
TABLE_ID: 11
TYPE: 3
N_FIELDS: 1
PAGE_NO: 304
SPACE: 0
MERGE_THRESHOLD: 50
3 rows in set (0.00 sec)
```
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